Power distribution network permanent fault identification method based on injected signal
A technology of permanent fault and signal injection, applied in the direction of the fault location, etc., can solve the problems that the permanent fault identification method cannot be applied to the distribution system, the topology is complex, and there are many branches of the distribution feeder.
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[0038] The present invention will be described in detail below with reference to specific embodiments.
[0039] A method for identifying permanent faults in distribution network based on injection signal, comprising the following steps:
[0040] Step 1: When the power distribution system is working normally, use the power frequency voltage and current to calculate the measured impedance of each line according to Ohm's law, and use it as the reference value for permanent fault judgment;
[0041] Step 2: After the fault occurs and is isolated, on the premise of judging the fault type and the fault phase, select the signal injection phase. If it is an interphase short circuit fault, the signal injection phase difference is the fault phase difference; if it is a three-phase short circuit fault, any two phases are selected as the signal injection phase difference;
[0042] The third step: collect the current and voltage values of the injected signal, calculate the measured imped...
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